Functions.php
Open up the functions.php file of the Twenty Ten theme. Locate the following section:
Tables can't be imported directly. Please insert an image of your table which can be found here.
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What follows is an array listing the current default headers and their location. To add your own, add a comma after the last parenthesis of the array of sunset header. Here’s an example of what it can look like after adding two more headers:
Tables can't be imported directly. Please insert an image of your table which can be found here.
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Lets dissect the code a little bit.
register_default_headers : This is the function that creates and displays our default headers. It accepts an array of parameters.
name: Sets a value with our headers name. We can then set an array of additional values and keys.
url: Relative path to the header image. Notice that the current path is /images/headers/image_name.jpg
thumbnail_url: Relative path to a thumbnail of the header image. Current path is /images/headers/image_name-thumbnail.jpg
description: A description of the image. This would be display upon hovering over the image inside the Headers Panel.
Things to Note
The Twenty Ten header is 940×198, anything bigger than that would be resized; anything smaller would be stretch to fit those dimensions. The thumbnail images can be set to any dimensions, 230×48 is the default. The images can only be .jpg or they will be ignored and won’t be displayed.